/* 196: the reverse-and-add machine, the 196 printout, and the survey of 10,000 numbers. */

.side {
  display: grid;
  gap: 56px;
}

/* The machine. Tiles shrink as the number grows, so a 16-digit sum still fits. */

.works {
  --slots: 3;
  --op: 28px;
  --gap: clamp(3px, calc(40px / var(--slots)), 10px);
  --tile-w: min(60px, (100cqi - var(--op) - (var(--slots) - 1) * var(--gap)) / var(--slots));
  --tile-h: calc(var(--tile-w) * 1.3);
  --row-w: calc(var(--slots) * (var(--tile-w) + var(--gap)) - var(--gap));
  --move-ms: 520ms;
  container-type: inline-size;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  margin: 18px 0 16px;
}

.row,
.carries {
  position: relative;
  box-sizing: content-box;
  width: var(--row-w);
  padding-left: var(--op);
  transition: width var(--move-ms) cubic-bezier(0.65, 0, 0.35, 1);
}

.row {
  height: var(--tile-h);
  transition-property: width, height;
}

.carries {
  height: 18px;
  margin-bottom: -4px;
}

.row--plus::before {
  content: '+';
  position: absolute;
  top: 50%;
  left: 0;
  width: calc(var(--op) - 8px);
  font-size: 1.7rem;
  font-weight: 700;
  line-height: 1;
  text-align: center;
  transform: translateY(-52%);
}

.rule {
  width: var(--row-w);
  height: 3px;
  margin-left: var(--op);
  border-radius: 2px;
  background: var(--ink);
  transition: width var(--move-ms) cubic-bezier(0.65, 0, 0.35, 1);
}

.works .tile,
.carry {
  position: absolute;
  right: 0;
  transform: translateX(calc(var(--slot) * -1 * (var(--tile-w) + var(--gap))));
  transition: transform var(--move-ms) cubic-bezier(0.65, 0, 0.35, 1);
}

.works .tile {
  top: 0;
  border-radius: min(10px, calc(var(--tile-w) * 0.2));
  box-shadow: inset 0 calc(var(--tile-h) * -0.06) 0 color-mix(in srgb, #000 30%, transparent);
  transition-property: transform, width, height, font-size;
}

.row[data-row='reversed'] .tile {
  background: var(--paper);
  color: var(--ink);
  box-shadow:
    inset 0 0 0 2px var(--ink),
    inset 0 calc(var(--tile-h) * -0.06) 0 color-mix(in srgb, var(--ink) 22%, transparent);
}

.carry {
  bottom: 0;
  width: var(--tile-w);
  color: var(--ink-soft);
  font: 700 0.85rem/1 var(--print);
  text-align: center;
}

.works.is-still .tile,
.works.is-still .carry,
.works.is-still .row,
.works.is-still .carries,
.works.is-still .rule {
  transition: none;
}

/* The tape prints one sum per step, with the step number on the left. */

.tape li {
  display: flex;
  justify-content: space-between;
  gap: 2ch;
}

.tape-step {
  color: var(--ink-soft);
}

.tape .tape-more {
  justify-content: flex-end;
}

/* Room for a three-line verdict, so the tape doesn't jump when it appears. */
.machine .verdict {
  min-height: 4.65em;
}

/* The printout */

.printout-head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 16px;
  max-width: 560px;
  margin-bottom: 16px;
}

.odometer {
  display: flex;
  gap: 22px;
  margin: 0 0 0 auto;
}

.odometer dt {
  color: var(--ink-soft);
  font-size: 0.85rem;
  font-weight: 600;
}

.odometer dd {
  margin: 0;
  font: 700 1.45rem/1.1 var(--print);
  font-variant-numeric: tabular-nums;
}

.sheet-slot {
  max-width: 560px;
  padding-top: 10px;
  border-top: 6px solid var(--key);
  border-radius: 3px 3px 0 0;
}

.sheet-slot canvas {
  display: block;
  width: 100%;
  aspect-ratio: 4 / 5;
  background: var(--paper);
}

.printout-status {
  max-width: 560px;
  min-height: 3em;
  margin-top: 14px;
  font-weight: 600;
}

/* The survey: 25 step counts, a gap, then the holdouts. */

.bars,
.bars-axis {
  grid-template-columns: repeat(25, 1fr) 0.6fr 1.4fr;
}

.bars .bar {
  width: min(14px, 72%);
  border-radius: 3px 3px 0 0;
}

.bars button:not(:disabled) {
  cursor: pointer;
}

.bars button:hover .bar,
.bars button:focus-visible .bar {
  outline: 2px solid var(--ink);
  outline-offset: 1px;
}

.bars-axis li {
  white-space: nowrap;
}

.bars-readout {
  min-height: 3.1em;
  margin-top: 14px;
  font-weight: 600;
}

@media (prefers-reduced-motion: reduce) {
  .works .tile,
  .carry,
  .row,
  .carries,
  .rule {
    transition: none;
  }
}